SNPP is the Suomi National Polar Partnership satellite flown by NASA and NOAA. It is the next generation polar orbiting satellite, collecting both daytime and nighttime data worldwide each day. The primary imager on SNPP is the Visible Infrared Imaging Radiometer Suite (VIIRS). At night the VIIRS day / night band (DNB) collects low light imaging data in the visible to enable detection of moonlit clouds. In addition to clouds, the DNB detects lights sources present at the earth's surface. This includes the detection of boats, especially thos using light to attract catch. Earth Observation Group (EOG) has worked since 2014 on algorithms to report the locations of boat detected based on lights with low temporal latency. The service started in S.E. Asia and has now been expanded to global.

Legend for V23 KMZ placemarks  (Show CSV Columns)

	Boat (QF=1)
	Weak (QF=2)
	Blurry (QF=3)
	Gas flare (QF=4)
	Glow (QF=7)
	Recurring light (QF=8)
	Weak and blurry (QF=10)
	Platform (QF=11)

Readme for V23 CSV columns  (Show KMZ Lengend)
For more details, download the readme file here.

Name	Explanation	Units	Fill Value
id	Integer VBD ID. Values are only unique for each input DNB file (starts at 1).	unitless
id_Key	Unique VBD ID	unitless	0
Date_Proc	Date/time of VBD processing	date-time	left blank
Lat_DNB	VBD pixel latitude from VIIRS geolocation file	degrees	left blank
Lon_DNB	VBD pixel longitude from VIIRS geolocation file	degrees	999999
Rad_DNB	Radiance of VBD pixel in VIIRS DNB band	nW/cm2/sr	999999
Date_Mscan	VBD pixel date-time at mid-scan reported in Universal Time.	date-time	left blank
Date_LTZ	VBD pixel date-time at mid-scan adjusted to standard time in the local time zone (LTZ). No adjustments for Daylight Savings Time (DST) are made.	date-time	left blank
Line_DNB	Line number of VBD pixel in VIIRS DNB band (starts at 1)	unitless	999999
Sample_DNB	Sample number of VBD pixel in VIIRS DNB band (starts at 1)	unitless	999999
Rad_I04	Radiance of VBD pixel in VIIRS I4 band (3.7 um)	W/m2/sr/um	999999
QF_Detect	Integer quality flag for VBD pixel, yielding informaiton about quality and type of detection (see field description tab).	unitless	999999
QF_Bitflag	Quality flag for VBD algorithm. The value is the sum of the bit flags derived from the tests performed on the pixel (see field description tab).	unitless	999999
SMI	Spike Median Index value for VBD pixel	unitless	999999
Thr_SMI	Spike Median Index threhsold for VBD pixel.	unitless	999999
SI	Sharpness Index value for VBD pixel	unitless	999999
Thr_SI	Sharpness Index threshold for VBD pixel	unitless	999999
SHI	Spike Height Index value for VBD pixel	unitless	999999
Thr_SHI	Spike Height Index threhsold for VBD pixel.	unitless	999999
LI	Lunar Illuminance value for VBD pixel	lux	999999
Thr_LI	Lunar Illuminance threshold. Pixels with LI values above Thr_LI are subject to the I-band cross-correlation algorithm to identify moonlit clouds.	lux	999999
Glint	Probability of having lunar glint impacting DNB data. Values range from 0-1.	unitless	999999
Thr_Gl_SMI	Spike Median Index threshold inside probable glint ellipse.	unitless	999999
Xcorr	DNB vs I-band local cross-correlation value. Values range from -1 to 1. A value of 2 indicates missing I-band data data	unitless	999999
Land_Mask	Land-sea mask flag. Land=0. Water=3. Near-shore=1,2.	unitless	999999
EEZ	Exclusive Economic Zone for VBD pixel.	unitless	left blank
FMZ	Fishery Management Zone for VBD pixel	unitless	left blank
MPA	Marine Protected Area for VBD pixel	unitless	left blank
File_DNB	VIIRS DNB HDF5 file	unitless	left blank
File_GDNBO	VIIRS DNB geolocation HDF5 file	unitless	left blank
File_I04	VIIRS I04 file	unitless	left blank
File_VNF	VIIRS Nightfire file used to cross-match VBD pixel with a concurrent flare location	unitless	left blank
File_EEZ	Exclusive Economic Zone reference vector file	unitless	left blank
File_FMZ	Fishery Management Zone reference vector file	unitless	left blank
File_MPA	Marine Protected Area reference vector file	unitless	left blank
File_FLM	Flare mask reference file used to cross-match VBD pixel with a known gas flare location	unitless	left blank
File_LSM	Land-sea mask reference file.	unitless	left blank
File_LTZ	Local time zone reference file containing vectors used to determine offset from UTC to LTZ.	unitless	left blank
File_RLP	Recurring light points vector file.	unitless	left blank
Dist_RLP	If detection is in a recurring location, this is the distance to the nearest recurring light point.	km	999999
File_RLV	Recurring light polygon vector file.	unitless	left blank
Lat_Gring	Latitude values as a series of semi-colon separated points that enclose the DNB swath data when connected by great-circle arcs.	degrees	999999
Lon_Gring	Longitude values as a series of semi-colon separated points that enclose the DNB swath data when connected by great-circle arcs.	degrees	999999
Gran_List	Granule names as a semi-colon separated list that were used to process this detection.	unitless	left blank
SOLZ_GDNBO	Solar zenith angle angle relative to the VBD pixel measured from the local vertical (from VIIRS GDNBO file)	degrees	999999
SOLA_GDNBO	Solar azimuth angle angle relative to the VBD pixel measured from the local North towards East (from VIIRS GDNBO file)	degrees	999999
SATZ_GDNBO	Satellite zenith angle relative to the VBD pixel measured from the local vertical (from VIIRS GDNBO file)	degrees	999999
SATA_GDNBO	Satellite azimuth angle relative to the VBD pixel measured from the local North towards East (from VIIRS GDNBO file)	degrees	999999
LUNZ_GDNBO	Lunar zenith angle angle relative to the VBD pixel measured from the local vertical (from VIIRS GDNBO file)	degrees	999999
LUNA_GDNBO	Lunar azimuth angle angle relative to the VBD pixel measured from the local North towards East (from VIIRS GDNBO file)	degrees	999999